#include "library.h"

double draw_special_line(double L, double limit)
{ if (L <= limit)
  { draw_distance(L);
    return L; }
  else
  { double L1 = draw_special_line(L/3, limit);
    turn_left_by_degrees(60);
    double L2 = draw_special_line(L/3, limit);
    turn_right_by_degrees(120);
    double L3 = draw_special_line(L/3, limit);
    turn_left_by_degrees(60);
    double L4 = draw_special_line(L/3, limit);
    return L1+L2+L3+L4; } }

double move(double limit)
{ double L = draw_special_line(350, limit);
  turn_right_by_degrees(120);
  return L; }

void main()
{ const double limit = read_double();
  make_window(600, 600);
  move_to(100, 150);
  set_heading_degrees(90);
  set_pen_width(2);
  double L1 = move(limit);
  double L2 = move(limit);
  double L3 = move(limit);
  cout << "Total perimeter is " << L1+L2+L3 << "\n"; }